Database of Zeolite Structures
 

Framework Type IRR
Reference Material
  Material Name: ITQ-44    
 
Chemical Formula:		  
[Si34.3Ge17.7O104]-IRR		  
   
Unit Cell: 		 
hexagonal
 P 6/m m m (# 191)
    a' = 19.5358 Å b' = 19.5358 Å c' = 14.4499 Å  
    α' = 90.000° β' = 90.000° γ' = 120.000°  
   
Framework Density: 		 
10.9 T/1000 Å3
 
  
Channels: 		 
[001] 18 12.5 x 12.5* <-> <100> 12 8.2 x 5.9**
Dimensionality
  Sorption (molecular cross section > 3.4Å): 3-dimensional
  Topological (pore opening > 6-ring): 3-dimensional
 
Stability:		  
stable to calcination in a dry atmosphere
   
References:
  Jiang, J., Jorda, J.L., Díaz-Cabañas, M.J., Yu, J. and Corma, A.
  "The synthesis of an extra-large-pore zeolite with double three-ring building units and a low framework density"
Angew. Chem. Int. Ed., 49, 4986-4988 (2010)
 
  
Name and Code derivation:
    Instituto de Tecnologia Quimica Valencia - forty-four
  ITQ-44 (forty-four)
  IRR
Limiting Rings
 
18-ring viewed along [001]

12-ring viewed along <100>


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